Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5989e2189f847a…

MALICIOUS

PDF

81.6 KB Created: 2021-03-15 04:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c202cc7f16cf1d878590621f20885c41 SHA-1: 2522f939f16f61bc01df5306794bba4e3e11d877 SHA-256: 3f5989e2189f847a1bd3c194bd825c9e00f86bd1339c84630aa21acd58813703
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various PDF files, likely intended to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/wix?keyword=caracteristicas+de+la+mesa+redonda+en+espa%25C3%25B1ol PDF link annotation
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/6372761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5fe9809c26144.pdfIn PDF document text
    • https://vamububok.weebly.com/uploads/1/3/5/3/135317225/4279483.pdfIn PDF document text
    • https://betozuwozoz.weebly.com/uploads/1/3/4/1/134108580/8287205.pdfIn PDF document text
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/3879554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481158/normal_5fc6b1eb09b28.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/dilikopufebebiten.pdfIn PDF document text
    • https://nozonefabizeg.weebly.com/uploads/1/3/0/9/130969368/gosirixidile.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/4780211.pdfIn PDF document text
    • https://bilezebije.weebly.com/uploads/1/3/4/3/134344171/pajak-feragu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/9915e1ea-b16e-4607-97d4-63bf45931491/mafegefusupidugidofodizup.pdfIn PDF document text
    • http://parepakikil.epizy.com/xudozafutomuwegidebi.pdfIn PDF document text
    • http://nixevafuzija.epizy.com/moment_convert_to_iso_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dedbe64-5479-4ba7-89c5-c9325a8a8f19/pulgadas_a_milimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e810db-2a62-4125-be09-564872156039/libro_de_espaol_lecturas_tercer_grado_1993.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_215342b6ec964dfd8758c7f0669f4f59.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_582692b473724d6d945887d705e8655a.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_7cbdf26de88f49249dac4669c29ea1d8.pdf?index=trueIn PDF document text
    • http://rimalapotozuf.epizy.com/82933740260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cfb4a5-b054-40ae-89f8-8fdb75a65d0a/44468893165.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5336 bytes
SHA-256: 970913d6f8397de35fc817de4f5169cb043cd1e3272d1e462f710ceeffbdb54e
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 7260 bytes
SHA-256: 3364cf2ef35515fb497666eb810c6205124ab0d1993e0ca68959ab8c7ddad9e6
font_02_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 12160 bytes
SHA-256: 68ad8ba9fdca33ea767d46985baa73cfee90d30ecdae252001c651bbac62cccd